wunder beta🔭 What the Webb Telescope Found
An infrared eye in deep space rewriting what we knew about the cosmos.
What you’ll learn
- Explain why Webb uses infrared light and what it has revealed about the early universe.Webb's infrared vision pierces dust and catches stretched light from distant, ancient galaxies, delivering the sharpest infrared images yet and the most distant black-hole merger ever detected.
- Describe how Webb studies exoplanet atmospheres through spectroscopy and interpret its findings cautiously.By reading absorbed starlight, Webb has found the best evidence yet for a rocky-planet atmosphere (55 Cancri e) and potential biosignature gases on K2-18b, clues that demand careful, skeptical follow-up.
Questions this course answers
Why does Webb observe in infrared light?
The expanding universe stretches distant light into the infrared, and infrared also penetrates dust clouds, letting Webb see far away and into stellar nurseries.
What record did Webb's observation of two merging galaxies set?
Webb found evidence of two galaxies and their massive black holes merging when the universe was about 740 million years old, the most distant black-hole merger ever obtained.
Why does looking at very distant objects mean looking into the past?
Because light travels at a finite speed, light arriving now from distant objects left them long ago, so Webb effectively watches the early universe.
How does Webb determine what an exoplanet's atmosphere is made of?
As starlight filters through a planet's atmosphere, gases absorb specific wavelengths; Webb measures the missing colors to infer the atmosphere's chemistry.
What was notable about Webb's study of 55 Cancri e?
Webb reported evidence of atmospheric gases around the hot rocky planet 55 Cancri e, the strongest evidence to date for a rocky-planet atmosphere beyond our Solar System.
Why is detecting carbon dioxide and methane on K2-18b not proof of life?
These molecules are only potential biosignatures because they can be produced by non-biological processes, so detection is a clue that requires careful follow-up, not a conclusion.
Grounded in trusted sources
- NASA Science, James Webb Space Telescope mission and latest news (science.nasa.gov/mission/webb)
- ESA/Webb, Press Releases 2024 (esawebb.org/news/archive/year/2024)
- PNAS, 'A first look at rocky exoplanets with JWST' (pnas.org/doi/10.1073/pnas.2416190122)
- Wikipedia, 'James Webb Space Telescope' (en.wikipedia.org/wiki/James_Webb_Space_Telescope)
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